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A Grim's vane wheel in an azimuthin propulsion unit

IP.com Disclosure Number: IPCOM000249053D
Publication Date: 2017-Jan-31
Document File: 2 page(s) / 123K

Publishing Venue

The IP.com Prior Art Database

Related People

Korsström Andrei: AUTHOR

Abstract

An azimuthing propulsion unit may use a pulling propeller. The slip stream from the propeller interacts with the strut and where installed the fin and the X-tail. A Grim's vane wheel positioned downstream of the propeller uses the rotational slip stream of the propeller to generate additional thrust for the azimuthing propulsion unit.

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© Copyright [2017] ABB. All rights reserved.

A GRIM'S VANE WHEEL IN AN AZIMUTING PROPULSION UNIT

An azimuthing propulsion unit type propulsion unit may use a pulling propeller. The slip

stream from the propeller interacts with the strut and where installed the fin and the X-

tail. An example of an azimuthing propulsion unit is Azipod® (registered trade mark of

ABB) manufactured by ABB.

The Grim's vane wheel uses the rotational slip stream of the propeller to generate

additional thrust for an azimuthing propulsion unit.

The Grim's vane wheel has been used on conventional shaft lines, but not on

azimuthing propulsion units, especially not propulsion units equipped with pulling

propellers.

By utilizing the rotational slip stream from the propeller to create more thrust for the unit

one can increase the efficiency of the propulsion unit.

The concept of the Grim’s vane wheel is to have a freely turning “propeller” behind the

actual propeller. I.e. when the propeller turns it introduces a rotational component in the

flow field behind it. The Grim’s vane wheel consists of a freely turning hub which is set

on the propeller shaft, but by bearings separated from the rotational motion of the shaft.

The vanes extended out from the hub are then designed so that the lower part of the

vane interact with the rotating slip stream from the propeller and hence, gives the vane

wheel a rotational motion. The upper part of the vane is then designed to give a thrust

due...